Public infrastructure is known for being utilitarian, uninspiring, and downright ugly. But not always. At first glance, this giant water storage system under Houston looks more like the pillared nave of an ancient cathedral. Now the lost space that’s larger than a football field is open for visits.

The Buffalo Bayou Park Cistern was built in 1926 to supply drinking water to the growing Texas city. Over 15 million gallons of water were stored here until the 1970s, when a mysterious leak was discovered that eventually put the reservoir out of commission. In 2010, as the land above the cistern was being transformed into a park, architects pried open a hatch and were stunned at the cave-like room filled with 221 columns.

The restoration process included installing walkways and railings so the public can now experience the beauty of the subterranean treasure. At first, all water was drained out so the room could be cleaned. “But then we put the water back in,” Anne Olson, president of the partnership that manages the park, told Next City. “Because one of the beauties of the site is that it has these incredible reflections.”

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Like London’s Thames Tunnel or DC’s Dupont Underground subway station, these long-abandoned feats of engineering are being re-opened and re-appreciated by new audiences who are transforming relics of a city’s past into a new kind of civic space. Like those spaces, the cistern was once slated for demolition—and at one point, planned to be a parking garage (???)—until the city saw the value of keeping it around.